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Fix docs for block stats monitor command
[qemu/stefanha.git] / block.c
blob782258016a4c93313a8703fe71990f5d4cb7bf54
1 /*
2 * QEMU System Emulator block driver
3 *
4 * Copyright (c) 2003 Fabrice Bellard
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to deal
8 * in the Software without restriction, including without limitation the rights
9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10 * copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
22 * THE SOFTWARE.
23 */
24 #include "config-host.h"
25 #include "qemu-common.h"
26 #include "monitor.h"
27 #include "block_int.h"
28 #include "module.h"
29 #include "qemu-objects.h"
30
31 #ifdef CONFIG_BSD
32 #include <sys/types.h>
33 #include <sys/stat.h>
34 #include <sys/ioctl.h>
35 #include <sys/queue.h>
36 #ifndef __DragonFly__
37 #include <sys/disk.h>
38 #endif
39 #endif
40
41 #ifdef _WIN32
42 #include <windows.h>
43 #endif
44
45 static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs,
46 int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
47 BlockDriverCompletionFunc *cb, void *opaque);
48 static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs,
49 int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
50 BlockDriverCompletionFunc *cb, void *opaque);
51 static BlockDriverAIOCB *bdrv_aio_flush_em(BlockDriverState *bs,
52 BlockDriverCompletionFunc *cb, void *opaque);
53 static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num,
54 uint8_t *buf, int nb_sectors);
55 static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num,
56 const uint8_t *buf, int nb_sectors);
57 static BlockDriver *find_protocol(const char *filename);
58
59 static QTAILQ_HEAD(, BlockDriverState) bdrv_states =
60 QTAILQ_HEAD_INITIALIZER(bdrv_states);
61
62 static QLIST_HEAD(, BlockDriver) bdrv_drivers =
63 QLIST_HEAD_INITIALIZER(bdrv_drivers);
64
65 /* If non-zero, use only whitelisted block drivers */
66 static int use_bdrv_whitelist;
67
68 int path_is_absolute(const char *path)
69 {
70 const char *p;
71 #ifdef _WIN32
72 /* specific case for names like: "\\.\d:" */
73 if (*path == '/' || *path == '\\')
74 return 1;
75 #endif
76 p = strchr(path, ':');
77 if (p)
78 p++;
79 else
80 p = path;
81 #ifdef _WIN32
82 return (*p == '/' || *p == '\\');
83 #else
84 return (*p == '/');
85 #endif
86 }
87
88 /* if filename is absolute, just copy it to dest. Otherwise, build a
89 path to it by considering it is relative to base_path. URL are
90 supported. */
91 void path_combine(char *dest, int dest_size,
92 const char *base_path,
93 const char *filename)
94 {
95 const char *p, *p1;
96 int len;
97
98 if (dest_size <= 0)
99 return;
100 if (path_is_absolute(filename)) {
101 pstrcpy(dest, dest_size, filename);
102 } else {
103 p = strchr(base_path, ':');
104 if (p)
105 p++;
106 else
107 p = base_path;
108 p1 = strrchr(base_path, '/');
109 #ifdef _WIN32
110 {
111 const char *p2;
112 p2 = strrchr(base_path, '\\');
113 if (!p1 || p2 > p1)
114 p1 = p2;
115 }
116 #endif
117 if (p1)
118 p1++;
119 else
120 p1 = base_path;
121 if (p1 > p)
122 p = p1;
123 len = p - base_path;
124 if (len > dest_size - 1)
125 len = dest_size - 1;
126 memcpy(dest, base_path, len);
127 dest[len] = '\0';
128 pstrcat(dest, dest_size, filename);
129 }
130 }
131
132 void bdrv_register(BlockDriver *bdrv)
133 {
134 if (!bdrv->bdrv_aio_readv) {
135 /* add AIO emulation layer */
136 bdrv->bdrv_aio_readv = bdrv_aio_readv_em;
137 bdrv->bdrv_aio_writev = bdrv_aio_writev_em;
138 } else if (!bdrv->bdrv_read) {
139 /* add synchronous IO emulation layer */
140 bdrv->bdrv_read = bdrv_read_em;
141 bdrv->bdrv_write = bdrv_write_em;
142 }
143
144 if (!bdrv->bdrv_aio_flush)
145 bdrv->bdrv_aio_flush = bdrv_aio_flush_em;
146
147 QLIST_INSERT_HEAD(&bdrv_drivers, bdrv, list);
148 }
149
150 /* create a new block device (by default it is empty) */
151 BlockDriverState *bdrv_new(const char *device_name)
152 {
153 BlockDriverState *bs;
154
155 bs = qemu_mallocz(sizeof(BlockDriverState));
156 pstrcpy(bs->device_name, sizeof(bs->device_name), device_name);
157 if (device_name[0] != '\0') {
158 QTAILQ_INSERT_TAIL(&bdrv_states, bs, list);
159 }
160 return bs;
161 }
162
163 BlockDriver *bdrv_find_format(const char *format_name)
164 {
165 BlockDriver *drv1;
166 QLIST_FOREACH(drv1, &bdrv_drivers, list) {
167 if (!strcmp(drv1->format_name, format_name)) {
168 return drv1;
169 }
170 }
171 return NULL;
172 }
173
174 static int bdrv_is_whitelisted(BlockDriver *drv)
175 {
176 static const char *whitelist[] = {
177 CONFIG_BDRV_WHITELIST
178 };
179 const char **p;
180
181 if (!whitelist[0])
182 return 1; /* no whitelist, anything goes */
183
184 for (p = whitelist; *p; p++) {
185 if (!strcmp(drv->format_name, *p)) {
186 return 1;
187 }
188 }
189 return 0;
190 }
191
192 BlockDriver *bdrv_find_whitelisted_format(const char *format_name)
193 {
194 BlockDriver *drv = bdrv_find_format(format_name);
195 return drv && bdrv_is_whitelisted(drv) ? drv : NULL;
196 }
197
198 int bdrv_create(BlockDriver *drv, const char* filename,
199 QEMUOptionParameter *options)
200 {
201 if (!drv->bdrv_create)
202 return -ENOTSUP;
203
204 return drv->bdrv_create(filename, options);
205 }
206
207 int bdrv_create_file(const char* filename, QEMUOptionParameter *options)
208 {
209 BlockDriver *drv;
210
211 drv = find_protocol(filename);
212 if (drv == NULL) {
213 drv = bdrv_find_format("file");
214 }
215
216 return bdrv_create(drv, filename, options);
217 }
218
219 #ifdef _WIN32
220 void get_tmp_filename(char *filename, int size)
221 {
222 char temp_dir[MAX_PATH];
223
224 GetTempPath(MAX_PATH, temp_dir);
225 GetTempFileName(temp_dir, "qem", 0, filename);
226 }
227 #else
228 void get_tmp_filename(char *filename, int size)
229 {
230 int fd;
231 const char *tmpdir;
232 /* XXX: race condition possible */
233 tmpdir = getenv("TMPDIR");
234 if (!tmpdir)
235 tmpdir = "/tmp";
236 snprintf(filename, size, "%s/vl.XXXXXX", tmpdir);
237 fd = mkstemp(filename);
238 close(fd);
239 }
240 #endif
241
242 #ifdef _WIN32
243 static int is_windows_drive_prefix(const char *filename)
244 {
245 return (((filename[0] >= 'a' && filename[0] <= 'z') ||
246 (filename[0] >= 'A' && filename[0] <= 'Z')) &&
247 filename[1] == ':');
248 }
249
250 int is_windows_drive(const char *filename)
251 {
252 if (is_windows_drive_prefix(filename) &&
253 filename[2] == '\0')
254 return 1;
255 if (strstart(filename, "\\\\.\\", NULL) ||
256 strstart(filename, "//./", NULL))
257 return 1;
258 return 0;
259 }
260 #endif
261
262 /*
263 * Detect host devices. By convention, /dev/cdrom[N] is always
264 * recognized as a host CDROM.
265 */
266 static BlockDriver *find_hdev_driver(const char *filename)
267 {
268 int score_max = 0, score;
269 BlockDriver *drv = NULL, *d;
270
271 QLIST_FOREACH(d, &bdrv_drivers, list) {
272 if (d->bdrv_probe_device) {
273 score = d->bdrv_probe_device(filename);
274 if (score > score_max) {
275 score_max = score;
276 drv = d;
277 }
278 }
279 }
280
281 return drv;
282 }
283
284 static BlockDriver *find_protocol(const char *filename)
285 {
286 BlockDriver *drv1;
287 char protocol[128];
288 int len;
289 const char *p;
290 int is_drive;
291
292 /* TODO Drivers without bdrv_file_open must be specified explicitly */
293
294 #ifdef _WIN32
295 is_drive = is_windows_drive(filename) ||
296 is_windows_drive_prefix(filename);
297 #else
298 is_drive = 0;
299 #endif
300 p = strchr(filename, ':');
301 if (!p || is_drive) {
302 drv1 = find_hdev_driver(filename);
303 if (!drv1) {
304 drv1 = bdrv_find_format("file");
305 }
306 return drv1;
307 }
308 len = p - filename;
309 if (len > sizeof(protocol) - 1)
310 len = sizeof(protocol) - 1;
311 memcpy(protocol, filename, len);
312 protocol[len] = '\0';
313 QLIST_FOREACH(drv1, &bdrv_drivers, list) {
314 if (drv1->protocol_name &&
315 !strcmp(drv1->protocol_name, protocol)) {
316 return drv1;
317 }
318 }
319 return NULL;
320 }
321
322 static BlockDriver *find_image_format(const char *filename)
323 {
324 int ret, score, score_max;
325 BlockDriver *drv1, *drv;
326 uint8_t buf[2048];
327 BlockDriverState *bs;
328
329 drv = find_protocol(filename);
330 /* no need to test disk image formats for vvfat */
331 if (drv && strcmp(drv->format_name, "vvfat") == 0)
332 return drv;
333
334 ret = bdrv_file_open(&bs, filename, 0);
335 if (ret < 0)
336 return NULL;
337 ret = bdrv_pread(bs, 0, buf, sizeof(buf));
338 bdrv_delete(bs);
339 if (ret < 0) {
340 return NULL;
341 }
342
343 score_max = 0;
344 drv = NULL;
345 QLIST_FOREACH(drv1, &bdrv_drivers, list) {
346 if (drv1->bdrv_probe) {
347 score = drv1->bdrv_probe(buf, ret, filename);
348 if (score > score_max) {
349 score_max = score;
350 drv = drv1;
351 }
352 }
353 }
354 return drv;
355 }
356
357 /**
358 * Set the current 'total_sectors' value
359 */
360 static int refresh_total_sectors(BlockDriverState *bs, int64_t hint)
361 {
362 BlockDriver *drv = bs->drv;
363
364 /* query actual device if possible, otherwise just trust the hint */
365 if (drv->bdrv_getlength) {
366 int64_t length = drv->bdrv_getlength(bs);
367 if (length < 0) {
368 return length;
369 }
370 hint = length >> BDRV_SECTOR_BITS;
371 }
372
373 bs->total_sectors = hint;
374 return 0;
375 }
376
377 /*
378 * Common part for opening disk images and files
379 */
380 static int bdrv_open_common(BlockDriverState *bs, const char *filename,
381 int flags, BlockDriver *drv)
382 {
383 int ret, open_flags;
384
385 assert(drv != NULL);
386
387 bs->file = NULL;
388 bs->total_sectors = 0;
389 bs->is_temporary = 0;
390 bs->encrypted = 0;
391 bs->valid_key = 0;
392 bs->open_flags = flags;
393 /* buffer_alignment defaulted to 512, drivers can change this value */
394 bs->buffer_alignment = 512;
395
396 pstrcpy(bs->filename, sizeof(bs->filename), filename);
397
398 if (use_bdrv_whitelist && !bdrv_is_whitelisted(drv)) {
399 return -ENOTSUP;
400 }
401
402 bs->drv = drv;
403 bs->opaque = qemu_mallocz(drv->instance_size);
404
405 /*
406 * Yes, BDRV_O_NOCACHE aka O_DIRECT means we have to present a
407 * write cache to the guest. We do need the fdatasync to flush
408 * out transactions for block allocations, and we maybe have a
409 * volatile write cache in our backing device to deal with.
410 */
411 if (flags & (BDRV_O_CACHE_WB|BDRV_O_NOCACHE))
412 bs->enable_write_cache = 1;
413
414 /*
415 * Clear flags that are internal to the block layer before opening the
416 * image.
417 */
418 open_flags = flags & ~(BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING);
419
420 /*
421 * Snapshots should be writeable.
422 */
423 if (bs->is_temporary) {
424 open_flags |= BDRV_O_RDWR;
425 }
426
427 /* Open the image, either directly or using a protocol */
428 if (drv->bdrv_file_open) {
429 ret = drv->bdrv_file_open(bs, filename, open_flags);
430 } else {
431 ret = bdrv_file_open(&bs->file, filename, open_flags);
432 if (ret >= 0) {
433 ret = drv->bdrv_open(bs, open_flags);
434 }
435 }
436
437 if (ret < 0) {
438 goto free_and_fail;
439 }
440
441 bs->keep_read_only = bs->read_only = !(open_flags & BDRV_O_RDWR);
442
443 ret = refresh_total_sectors(bs, bs->total_sectors);
444 if (ret < 0) {
445 goto free_and_fail;
446 }
447
448 #ifndef _WIN32
449 if (bs->is_temporary) {
450 unlink(filename);
451 }
452 #endif
453 return 0;
454
455 free_and_fail:
456 if (bs->file) {
457 bdrv_delete(bs->file);
458 bs->file = NULL;
459 }
460 qemu_free(bs->opaque);
461 bs->opaque = NULL;
462 bs->drv = NULL;
463 return ret;
464 }
465
466 /*
467 * Opens a file using a protocol (file, host_device, nbd, ...)
468 */
469 int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags)
470 {
471 BlockDriverState *bs;
472 BlockDriver *drv;
473 int ret;
474
475 drv = find_protocol(filename);
476 if (!drv) {
477 return -ENOENT;
478 }
479
480 bs = bdrv_new("");
481 ret = bdrv_open_common(bs, filename, flags, drv);
482 if (ret < 0) {
483 bdrv_delete(bs);
484 return ret;
485 }
486 bs->growable = 1;
487 *pbs = bs;
488 return 0;
489 }
490
491 /*
492 * Opens a disk image (raw, qcow2, vmdk, ...)
493 */
494 int bdrv_open(BlockDriverState *bs, const char *filename, int flags,
495 BlockDriver *drv)
496 {
497 int ret;
498
499 if (flags & BDRV_O_SNAPSHOT) {
500 BlockDriverState *bs1;
501 int64_t total_size;
502 int is_protocol = 0;
503 BlockDriver *bdrv_qcow2;
504 QEMUOptionParameter *options;
505 char tmp_filename[PATH_MAX];
506 char backing_filename[PATH_MAX];
507
508 /* if snapshot, we create a temporary backing file and open it
509 instead of opening 'filename' directly */
510
511 /* if there is a backing file, use it */
512 bs1 = bdrv_new("");
513 ret = bdrv_open(bs1, filename, 0, drv);
514 if (ret < 0) {
515 bdrv_delete(bs1);
516 return ret;
517 }
518 total_size = bdrv_getlength(bs1) >> BDRV_SECTOR_BITS;
519
520 if (bs1->drv && bs1->drv->protocol_name)
521 is_protocol = 1;
522
523 bdrv_delete(bs1);
524
525 get_tmp_filename(tmp_filename, sizeof(tmp_filename));
526
527 /* Real path is meaningless for protocols */
528 if (is_protocol)
529 snprintf(backing_filename, sizeof(backing_filename),
530 "%s", filename);
531 else if (!realpath(filename, backing_filename))
532 return -errno;
533
534 bdrv_qcow2 = bdrv_find_format("qcow2");
535 options = parse_option_parameters("", bdrv_qcow2->create_options, NULL);
536
537 set_option_parameter_int(options, BLOCK_OPT_SIZE, total_size * 512);
538 set_option_parameter(options, BLOCK_OPT_BACKING_FILE, backing_filename);
539 if (drv) {
540 set_option_parameter(options, BLOCK_OPT_BACKING_FMT,
541 drv->format_name);
542 }
543
544 ret = bdrv_create(bdrv_qcow2, tmp_filename, options);
545 free_option_parameters(options);
546 if (ret < 0) {
547 return ret;
548 }
549
550 filename = tmp_filename;
551 drv = bdrv_qcow2;
552 bs->is_temporary = 1;
553 }
554
555 /* Find the right image format driver */
556 if (!drv) {
557 drv = find_image_format(filename);
558 }
559
560 if (!drv) {
561 ret = -ENOENT;
562 goto unlink_and_fail;
563 }
564
565 /* Open the image */
566 ret = bdrv_open_common(bs, filename, flags, drv);
567 if (ret < 0) {
568 goto unlink_and_fail;
569 }
570
571 /* If there is a backing file, use it */
572 if ((flags & BDRV_O_NO_BACKING) == 0 && bs->backing_file[0] != '\0') {
573 char backing_filename[PATH_MAX];
574 int back_flags;
575 BlockDriver *back_drv = NULL;
576
577 bs->backing_hd = bdrv_new("");
578 path_combine(backing_filename, sizeof(backing_filename),
579 filename, bs->backing_file);
580 if (bs->backing_format[0] != '\0')
581 back_drv = bdrv_find_format(bs->backing_format);
582
583 /* backing files always opened read-only */
584 back_flags =
585 flags & ~(BDRV_O_RDWR | BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING);
586
587 ret = bdrv_open(bs->backing_hd, backing_filename, back_flags, back_drv);
588 if (ret < 0) {
589 bdrv_close(bs);
590 return ret;
591 }
592 if (bs->is_temporary) {
593 bs->backing_hd->keep_read_only = !(flags & BDRV_O_RDWR);
594 } else {
595 /* base image inherits from "parent" */
596 bs->backing_hd->keep_read_only = bs->keep_read_only;
597 }
598 }
599
600 if (!bdrv_key_required(bs)) {
601 /* call the change callback */
602 bs->media_changed = 1;
603 if (bs->change_cb)
604 bs->change_cb(bs->change_opaque);
605 }
606
607 return 0;
608
609 unlink_and_fail:
610 if (bs->is_temporary) {
611 unlink(filename);
612 }
613 return ret;
614 }
615
616 void bdrv_close(BlockDriverState *bs)
617 {
618 if (bs->drv) {
619 if (bs->backing_hd) {
620 bdrv_delete(bs->backing_hd);
621 bs->backing_hd = NULL;
622 }
623 bs->drv->bdrv_close(bs);
624 qemu_free(bs->opaque);
625 #ifdef _WIN32
626 if (bs->is_temporary) {
627 unlink(bs->filename);
628 }
629 #endif
630 bs->opaque = NULL;
631 bs->drv = NULL;
632
633 if (bs->file != NULL) {
634 bdrv_close(bs->file);
635 }
636
637 /* call the change callback */
638 bs->media_changed = 1;
639 if (bs->change_cb)
640 bs->change_cb(bs->change_opaque);
641 }
642 }
643
644 void bdrv_delete(BlockDriverState *bs)
645 {
646 /* remove from list, if necessary */
647 if (bs->device_name[0] != '\0') {
648 QTAILQ_REMOVE(&bdrv_states, bs, list);
649 }
650
651 bdrv_close(bs);
652 if (bs->file != NULL) {
653 bdrv_delete(bs->file);
654 }
655
656 qemu_free(bs);
657 }
658
659 /*
660 * Run consistency checks on an image
661 *
662 * Returns the number of errors or -errno when an internal error occurs
663 */
664 int bdrv_check(BlockDriverState *bs)
665 {
666 if (bs->drv->bdrv_check == NULL) {
667 return -ENOTSUP;
668 }
669
670 return bs->drv->bdrv_check(bs);
671 }
672
673 /* commit COW file into the raw image */
674 int bdrv_commit(BlockDriverState *bs)
675 {
676 BlockDriver *drv = bs->drv;
677 int64_t i, total_sectors;
678 int n, j, ro, open_flags;
679 int ret = 0, rw_ret = 0;
680 unsigned char sector[512];
681 char filename[1024];
682 BlockDriverState *bs_rw, *bs_ro;
683
684 if (!drv)
685 return -ENOMEDIUM;
686
687 if (!bs->backing_hd) {
688 return -ENOTSUP;
689 }
690
691 if (bs->backing_hd->keep_read_only) {
692 return -EACCES;
693 }
694
695 ro = bs->backing_hd->read_only;
696 strncpy(filename, bs->backing_hd->filename, sizeof(filename));
697 open_flags = bs->backing_hd->open_flags;
698
699 if (ro) {
700 /* re-open as RW */
701 bdrv_delete(bs->backing_hd);
702 bs->backing_hd = NULL;
703 bs_rw = bdrv_new("");
704 rw_ret = bdrv_open(bs_rw, filename, open_flags | BDRV_O_RDWR, drv);
705 if (rw_ret < 0) {
706 bdrv_delete(bs_rw);
707 /* try to re-open read-only */
708 bs_ro = bdrv_new("");
709 ret = bdrv_open(bs_ro, filename, open_flags & ~BDRV_O_RDWR, drv);
710 if (ret < 0) {
711 bdrv_delete(bs_ro);
712 /* drive not functional anymore */
713 bs->drv = NULL;
714 return ret;
715 }
716 bs->backing_hd = bs_ro;
717 return rw_ret;
718 }
719 bs->backing_hd = bs_rw;
720 }
721
722 total_sectors = bdrv_getlength(bs) >> BDRV_SECTOR_BITS;
723 for (i = 0; i < total_sectors;) {
724 if (drv->bdrv_is_allocated(bs, i, 65536, &n)) {
725 for(j = 0; j < n; j++) {
726 if (bdrv_read(bs, i, sector, 1) != 0) {
727 ret = -EIO;
728 goto ro_cleanup;
729 }
730
731 if (bdrv_write(bs->backing_hd, i, sector, 1) != 0) {
732 ret = -EIO;
733 goto ro_cleanup;
734 }
735 i++;
736 }
737 } else {
738 i += n;
739 }
740 }
741
742 if (drv->bdrv_make_empty) {
743 ret = drv->bdrv_make_empty(bs);
744 bdrv_flush(bs);
745 }
746
747 /*
748 * Make sure all data we wrote to the backing device is actually
749 * stable on disk.
750 */
751 if (bs->backing_hd)
752 bdrv_flush(bs->backing_hd);
753
754 ro_cleanup:
755
756 if (ro) {
757 /* re-open as RO */
758 bdrv_delete(bs->backing_hd);
759 bs->backing_hd = NULL;
760 bs_ro = bdrv_new("");
761 ret = bdrv_open(bs_ro, filename, open_flags & ~BDRV_O_RDWR, drv);
762 if (ret < 0) {
763 bdrv_delete(bs_ro);
764 /* drive not functional anymore */
765 bs->drv = NULL;
766 return ret;
767 }
768 bs->backing_hd = bs_ro;
769 bs->backing_hd->keep_read_only = 0;
770 }
771
772 return ret;
773 }
774
775 /*
776 * Return values:
777 * 0 - success
778 * -EINVAL - backing format specified, but no file
779 * -ENOSPC - can't update the backing file because no space is left in the
780 * image file header
781 * -ENOTSUP - format driver doesn't support changing the backing file
782 */
783 int bdrv_change_backing_file(BlockDriverState *bs,
784 const char *backing_file, const char *backing_fmt)
785 {
786 BlockDriver *drv = bs->drv;
787
788 if (drv->bdrv_change_backing_file != NULL) {
789 return drv->bdrv_change_backing_file(bs, backing_file, backing_fmt);
790 } else {
791 return -ENOTSUP;
792 }
793 }
794
795 static int bdrv_check_byte_request(BlockDriverState *bs, int64_t offset,
796 size_t size)
797 {
798 int64_t len;
799
800 if (!bdrv_is_inserted(bs))
801 return -ENOMEDIUM;
802
803 if (bs->growable)
804 return 0;
805
806 len = bdrv_getlength(bs);
807
808 if (offset < 0)
809 return -EIO;
810
811 if ((offset > len) || (len - offset < size))
812 return -EIO;
813
814 return 0;
815 }
816
817 static int bdrv_check_request(BlockDriverState *bs, int64_t sector_num,
818 int nb_sectors)
819 {
820 return bdrv_check_byte_request(bs, sector_num * 512, nb_sectors * 512);
821 }
822
823 /* return < 0 if error. See bdrv_write() for the return codes */
824 int bdrv_read(BlockDriverState *bs, int64_t sector_num,
825 uint8_t *buf, int nb_sectors)
826 {
827 BlockDriver *drv = bs->drv;
828
829 if (!drv)
830 return -ENOMEDIUM;
831 if (bdrv_check_request(bs, sector_num, nb_sectors))
832 return -EIO;
833
834 return drv->bdrv_read(bs, sector_num, buf, nb_sectors);
835 }
836
837 static void set_dirty_bitmap(BlockDriverState *bs, int64_t sector_num,
838 int nb_sectors, int dirty)
839 {
840 int64_t start, end;
841 unsigned long val, idx, bit;
842
843 start = sector_num / BDRV_SECTORS_PER_DIRTY_CHUNK;
844 end = (sector_num + nb_sectors - 1) / BDRV_SECTORS_PER_DIRTY_CHUNK;
845
846 for (; start <= end; start++) {
847 idx = start / (sizeof(unsigned long) * 8);
848 bit = start % (sizeof(unsigned long) * 8);
849 val = bs->dirty_bitmap[idx];
850 if (dirty) {
851 if (!(val & (1 << bit))) {
852 bs->dirty_count++;
853 val |= 1 << bit;
854 }
855 } else {
856 if (val & (1 << bit)) {
857 bs->dirty_count--;
858 val &= ~(1 << bit);
859 }
860 }
861 bs->dirty_bitmap[idx] = val;
862 }
863 }
864
865 /* Return < 0 if error. Important errors are:
866 -EIO generic I/O error (may happen for all errors)
867 -ENOMEDIUM No media inserted.
868 -EINVAL Invalid sector number or nb_sectors
869 -EACCES Trying to write a read-only device
870 */
871 int bdrv_write(BlockDriverState *bs, int64_t sector_num,
872 const uint8_t *buf, int nb_sectors)
873 {
874 BlockDriver *drv = bs->drv;
875 if (!bs->drv)
876 return -ENOMEDIUM;
877 if (bs->read_only)
878 return -EACCES;
879 if (bdrv_check_request(bs, sector_num, nb_sectors))
880 return -EIO;
881
882 if (bs->dirty_bitmap) {
883 set_dirty_bitmap(bs, sector_num, nb_sectors, 1);
884 }
885
886 if (bs->wr_highest_sector < sector_num + nb_sectors - 1) {
887 bs->wr_highest_sector = sector_num + nb_sectors - 1;
888 }
889
890 return drv->bdrv_write(bs, sector_num, buf, nb_sectors);
891 }
892
893 int bdrv_pread(BlockDriverState *bs, int64_t offset,
894 void *buf, int count1)
895 {
896 uint8_t tmp_buf[BDRV_SECTOR_SIZE];
897 int len, nb_sectors, count;
898 int64_t sector_num;
899 int ret;
900
901 count = count1;
902 /* first read to align to sector start */
903 len = (BDRV_SECTOR_SIZE - offset) & (BDRV_SECTOR_SIZE - 1);
904 if (len > count)
905 len = count;
906 sector_num = offset >> BDRV_SECTOR_BITS;
907 if (len > 0) {
908 if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0)
909 return ret;
910 memcpy(buf, tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), len);
911 count -= len;
912 if (count == 0)
913 return count1;
914 sector_num++;
915 buf += len;
916 }
917
918 /* read the sectors "in place" */
919 nb_sectors = count >> BDRV_SECTOR_BITS;
920 if (nb_sectors > 0) {
921 if ((ret = bdrv_read(bs, sector_num, buf, nb_sectors)) < 0)
922 return ret;
923 sector_num += nb_sectors;
924 len = nb_sectors << BDRV_SECTOR_BITS;
925 buf += len;
926 count -= len;
927 }
928
929 /* add data from the last sector */
930 if (count > 0) {
931 if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0)
932 return ret;
933 memcpy(buf, tmp_buf, count);
934 }
935 return count1;
936 }
937
938 int bdrv_pwrite(BlockDriverState *bs, int64_t offset,
939 const void *buf, int count1)
940 {
941 uint8_t tmp_buf[BDRV_SECTOR_SIZE];
942 int len, nb_sectors, count;
943 int64_t sector_num;
944 int ret;
945
946 count = count1;
947 /* first write to align to sector start */
948 len = (BDRV_SECTOR_SIZE - offset) & (BDRV_SECTOR_SIZE - 1);
949 if (len > count)
950 len = count;
951 sector_num = offset >> BDRV_SECTOR_BITS;
952 if (len > 0) {
953 if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0)
954 return ret;
955 memcpy(tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), buf, len);
956 if ((ret = bdrv_write(bs, sector_num, tmp_buf, 1)) < 0)
957 return ret;
958 count -= len;
959 if (count == 0)
960 return count1;
961 sector_num++;
962 buf += len;
963 }
964
965 /* write the sectors "in place" */
966 nb_sectors = count >> BDRV_SECTOR_BITS;
967 if (nb_sectors > 0) {
968 if ((ret = bdrv_write(bs, sector_num, buf, nb_sectors)) < 0)
969 return ret;
970 sector_num += nb_sectors;
971 len = nb_sectors << BDRV_SECTOR_BITS;
972 buf += len;
973 count -= len;
974 }
975
976 /* add data from the last sector */
977 if (count > 0) {
978 if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0)
979 return ret;
980 memcpy(tmp_buf, buf, count);
981 if ((ret = bdrv_write(bs, sector_num, tmp_buf, 1)) < 0)
982 return ret;
983 }
984 return count1;
985 }
986
987 /**
988 * Truncate file to 'offset' bytes (needed only for file protocols)
989 */
990 int bdrv_truncate(BlockDriverState *bs, int64_t offset)
991 {
992 BlockDriver *drv = bs->drv;
993 int ret;
994 if (!drv)
995 return -ENOMEDIUM;
996 if (!drv->bdrv_truncate)
997 return -ENOTSUP;
998 if (bs->read_only)
999 return -EACCES;
1000 ret = drv->bdrv_truncate(bs, offset);
1001 if (ret == 0) {
1002 ret = refresh_total_sectors(bs, offset >> BDRV_SECTOR_BITS);
1003 }
1004 return ret;
1005 }
1006
1007 /**
1008 * Length of a file in bytes. Return < 0 if error or unknown.
1009 */
1010 int64_t bdrv_getlength(BlockDriverState *bs)
1011 {
1012 BlockDriver *drv = bs->drv;
1013 if (!drv)
1014 return -ENOMEDIUM;
1015
1016 /* Fixed size devices use the total_sectors value for speed instead of
1017 issuing a length query (like lseek) on each call. Also, legacy block
1018 drivers don't provide a bdrv_getlength function and must use
1019 total_sectors. */
1020 if (!bs->growable || !drv->bdrv_getlength) {
1021 return bs->total_sectors * BDRV_SECTOR_SIZE;
1022 }
1023 return drv->bdrv_getlength(bs);
1024 }
1025
1026 /* return 0 as number of sectors if no device present or error */
1027 void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr)
1028 {
1029 int64_t length;
1030 length = bdrv_getlength(bs);
1031 if (length < 0)
1032 length = 0;
1033 else
1034 length = length >> BDRV_SECTOR_BITS;
1035 *nb_sectors_ptr = length;
1036 }
1037
1038 struct partition {
1039 uint8_t boot_ind; /* 0x80 - active */
1040 uint8_t head; /* starting head */
1041 uint8_t sector; /* starting sector */
1042 uint8_t cyl; /* starting cylinder */
1043 uint8_t sys_ind; /* What partition type */
1044 uint8_t end_head; /* end head */
1045 uint8_t end_sector; /* end sector */
1046 uint8_t end_cyl; /* end cylinder */
1047 uint32_t start_sect; /* starting sector counting from 0 */
1048 uint32_t nr_sects; /* nr of sectors in partition */
1049 } __attribute__((packed));
1050
1051 /* try to guess the disk logical geometry from the MSDOS partition table. Return 0 if OK, -1 if could not guess */
1052 static int guess_disk_lchs(BlockDriverState *bs,
1053 int *pcylinders, int *pheads, int *psectors)
1054 {
1055 uint8_t buf[512];
1056 int ret, i, heads, sectors, cylinders;
1057 struct partition *p;
1058 uint32_t nr_sects;
1059 uint64_t nb_sectors;
1060
1061 bdrv_get_geometry(bs, &nb_sectors);
1062
1063 ret = bdrv_read(bs, 0, buf, 1);
1064 if (ret < 0)
1065 return -1;
1066 /* test msdos magic */
1067 if (buf[510] != 0x55 || buf[511] != 0xaa)
1068 return -1;
1069 for(i = 0; i < 4; i++) {
1070 p = ((struct partition *)(buf + 0x1be)) + i;
1071 nr_sects = le32_to_cpu(p->nr_sects);
1072 if (nr_sects && p->end_head) {
1073 /* We make the assumption that the partition terminates on
1074 a cylinder boundary */
1075 heads = p->end_head + 1;
1076 sectors = p->end_sector & 63;
1077 if (sectors == 0)
1078 continue;
1079 cylinders = nb_sectors / (heads * sectors);
1080 if (cylinders < 1 || cylinders > 16383)
1081 continue;
1082 *pheads = heads;
1083 *psectors = sectors;
1084 *pcylinders = cylinders;
1085 #if 0
1086 printf("guessed geometry: LCHS=%d %d %d\n",
1087 cylinders, heads, sectors);
1088 #endif
1089 return 0;
1090 }
1091 }
1092 return -1;
1093 }
1094
1095 void bdrv_guess_geometry(BlockDriverState *bs, int *pcyls, int *pheads, int *psecs)
1096 {
1097 int translation, lba_detected = 0;
1098 int cylinders, heads, secs;
1099 uint64_t nb_sectors;
1100
1101 /* if a geometry hint is available, use it */
1102 bdrv_get_geometry(bs, &nb_sectors);
1103 bdrv_get_geometry_hint(bs, &cylinders, &heads, &secs);
1104 translation = bdrv_get_translation_hint(bs);
1105 if (cylinders != 0) {
1106 *pcyls = cylinders;
1107 *pheads = heads;
1108 *psecs = secs;
1109 } else {
1110 if (guess_disk_lchs(bs, &cylinders, &heads, &secs) == 0) {
1111 if (heads > 16) {
1112 /* if heads > 16, it means that a BIOS LBA
1113 translation was active, so the default
1114 hardware geometry is OK */
1115 lba_detected = 1;
1116 goto default_geometry;
1117 } else {
1118 *pcyls = cylinders;
1119 *pheads = heads;
1120 *psecs = secs;
1121 /* disable any translation to be in sync with
1122 the logical geometry */
1123 if (translation == BIOS_ATA_TRANSLATION_AUTO) {
1124 bdrv_set_translation_hint(bs,
1125 BIOS_ATA_TRANSLATION_NONE);
1126 }
1127 }
1128 } else {
1129 default_geometry:
1130 /* if no geometry, use a standard physical disk geometry */
1131 cylinders = nb_sectors / (16 * 63);
1132
1133 if (cylinders > 16383)
1134 cylinders = 16383;
1135 else if (cylinders < 2)
1136 cylinders = 2;
1137 *pcyls = cylinders;
1138 *pheads = 16;
1139 *psecs = 63;
1140 if ((lba_detected == 1) && (translation == BIOS_ATA_TRANSLATION_AUTO)) {
1141 if ((*pcyls * *pheads) <= 131072) {
1142 bdrv_set_translation_hint(bs,
1143 BIOS_ATA_TRANSLATION_LARGE);
1144 } else {
1145 bdrv_set_translation_hint(bs,
1146 BIOS_ATA_TRANSLATION_LBA);
1147 }
1148 }
1149 }
1150 bdrv_set_geometry_hint(bs, *pcyls, *pheads, *psecs);
1151 }
1152 }
1153
1154 void bdrv_set_geometry_hint(BlockDriverState *bs,
1155 int cyls, int heads, int secs)
1156 {
1157 bs->cyls = cyls;
1158 bs->heads = heads;
1159 bs->secs = secs;
1160 }
1161
1162 void bdrv_set_type_hint(BlockDriverState *bs, int type)
1163 {
1164 bs->type = type;
1165 bs->removable = ((type == BDRV_TYPE_CDROM ||
1166 type == BDRV_TYPE_FLOPPY));
1167 }
1168
1169 void bdrv_set_translation_hint(BlockDriverState *bs, int translation)
1170 {
1171 bs->translation = translation;
1172 }
1173
1174 void bdrv_get_geometry_hint(BlockDriverState *bs,
1175 int *pcyls, int *pheads, int *psecs)
1176 {
1177 *pcyls = bs->cyls;
1178 *pheads = bs->heads;
1179 *psecs = bs->secs;
1180 }
1181
1182 int bdrv_get_type_hint(BlockDriverState *bs)
1183 {
1184 return bs->type;
1185 }
1186
1187 int bdrv_get_translation_hint(BlockDriverState *bs)
1188 {
1189 return bs->translation;
1190 }
1191
1192 int bdrv_is_removable(BlockDriverState *bs)
1193 {
1194 return bs->removable;
1195 }
1196
1197 int bdrv_is_read_only(BlockDriverState *bs)
1198 {
1199 return bs->read_only;
1200 }
1201
1202 int bdrv_is_sg(BlockDriverState *bs)
1203 {
1204 return bs->sg;
1205 }
1206
1207 int bdrv_enable_write_cache(BlockDriverState *bs)
1208 {
1209 return bs->enable_write_cache;
1210 }
1211
1212 /* XXX: no longer used */
1213 void bdrv_set_change_cb(BlockDriverState *bs,
1214 void (*change_cb)(void *opaque), void *opaque)
1215 {
1216 bs->change_cb = change_cb;
1217 bs->change_opaque = opaque;
1218 }
1219
1220 int bdrv_is_encrypted(BlockDriverState *bs)
1221 {
1222 if (bs->backing_hd && bs->backing_hd->encrypted)
1223 return 1;
1224 return bs->encrypted;
1225 }
1226
1227 int bdrv_key_required(BlockDriverState *bs)
1228 {
1229 BlockDriverState *backing_hd = bs->backing_hd;
1230
1231 if (backing_hd && backing_hd->encrypted && !backing_hd->valid_key)
1232 return 1;
1233 return (bs->encrypted && !bs->valid_key);
1234 }
1235
1236 int bdrv_set_key(BlockDriverState *bs, const char *key)
1237 {
1238 int ret;
1239 if (bs->backing_hd && bs->backing_hd->encrypted) {
1240 ret = bdrv_set_key(bs->backing_hd, key);
1241 if (ret < 0)
1242 return ret;
1243 if (!bs->encrypted)
1244 return 0;
1245 }
1246 if (!bs->encrypted) {
1247 return -EINVAL;
1248 } else if (!bs->drv || !bs->drv->bdrv_set_key) {
1249 return -ENOMEDIUM;
1250 }
1251 ret = bs->drv->bdrv_set_key(bs, key);
1252 if (ret < 0) {
1253 bs->valid_key = 0;
1254 } else if (!bs->valid_key) {
1255 bs->valid_key = 1;
1256 /* call the change callback now, we skipped it on open */
1257 bs->media_changed = 1;
1258 if (bs->change_cb)
1259 bs->change_cb(bs->change_opaque);
1260 }
1261 return ret;
1262 }
1263
1264 void bdrv_get_format(BlockDriverState *bs, char *buf, int buf_size)
1265 {
1266 if (!bs->drv) {
1267 buf[0] = '\0';
1268 } else {
1269 pstrcpy(buf, buf_size, bs->drv->format_name);
1270 }
1271 }
1272
1273 void bdrv_iterate_format(void (*it)(void *opaque, const char *name),
1274 void *opaque)
1275 {
1276 BlockDriver *drv;
1277
1278 QLIST_FOREACH(drv, &bdrv_drivers, list) {
1279 it(opaque, drv->format_name);
1280 }
1281 }
1282
1283 BlockDriverState *bdrv_find(const char *name)
1284 {
1285 BlockDriverState *bs;
1286
1287 QTAILQ_FOREACH(bs, &bdrv_states, list) {
1288 if (!strcmp(name, bs->device_name)) {
1289 return bs;
1290 }
1291 }
1292 return NULL;
1293 }
1294
1295 void bdrv_iterate(void (*it)(void *opaque, BlockDriverState *bs), void *opaque)
1296 {
1297 BlockDriverState *bs;
1298
1299 QTAILQ_FOREACH(bs, &bdrv_states, list) {
1300 it(opaque, bs);
1301 }
1302 }
1303
1304 const char *bdrv_get_device_name(BlockDriverState *bs)
1305 {
1306 return bs->device_name;
1307 }
1308
1309 void bdrv_flush(BlockDriverState *bs)
1310 {
1311 if (bs->drv && bs->drv->bdrv_flush)
1312 bs->drv->bdrv_flush(bs);
1313 }
1314
1315 void bdrv_flush_all(void)
1316 {
1317 BlockDriverState *bs;
1318
1319 QTAILQ_FOREACH(bs, &bdrv_states, list) {
1320 if (bs->drv && !bdrv_is_read_only(bs) &&
1321 (!bdrv_is_removable(bs) || bdrv_is_inserted(bs))) {
1322 bdrv_flush(bs);
1323 }
1324 }
1325 }
1326
1327 int bdrv_has_zero_init(BlockDriverState *bs)
1328 {
1329 assert(bs->drv);
1330
1331 if (bs->drv->no_zero_init) {
1332 return 0;
1333 } else if (bs->file) {
1334 return bdrv_has_zero_init(bs->file);
1335 }
1336
1337 return 1;
1338 }
1339
1340 /*
1341 * Returns true iff the specified sector is present in the disk image. Drivers
1342 * not implementing the functionality are assumed to not support backing files,
1343 * hence all their sectors are reported as allocated.
1344 *
1345 * 'pnum' is set to the number of sectors (including and immediately following
1346 * the specified sector) that are known to be in the same
1347 * allocated/unallocated state.
1348 *
1349 * 'nb_sectors' is the max value 'pnum' should be set to.
1350 */
1351 int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors,
1352 int *pnum)
1353 {
1354 int64_t n;
1355 if (!bs->drv->bdrv_is_allocated) {
1356 if (sector_num >= bs->total_sectors) {
1357 *pnum = 0;
1358 return 0;
1359 }
1360 n = bs->total_sectors - sector_num;
1361 *pnum = (n < nb_sectors) ? (n) : (nb_sectors);
1362 return 1;
1363 }
1364 return bs->drv->bdrv_is_allocated(bs, sector_num, nb_sectors, pnum);
1365 }
1366
1367 void bdrv_mon_event(const BlockDriverState *bdrv,
1368 BlockMonEventAction action, int is_read)
1369 {
1370 QObject *data;
1371 const char *action_str;
1372
1373 switch (action) {
1374 case BDRV_ACTION_REPORT:
1375 action_str = "report";
1376 break;
1377 case BDRV_ACTION_IGNORE:
1378 action_str = "ignore";
1379 break;
1380 case BDRV_ACTION_STOP:
1381 action_str = "stop";
1382 break;
1383 default:
1384 abort();
1385 }
1386
1387 data = qobject_from_jsonf("{ 'device': %s, 'action': %s, 'operation': %s }",
1388 bdrv->device_name,
1389 action_str,
1390 is_read ? "read" : "write");
1391 monitor_protocol_event(QEVENT_BLOCK_IO_ERROR, data);
1392
1393 qobject_decref(data);
1394 }
1395
1396 static void bdrv_print_dict(QObject *obj, void *opaque)
1397 {
1398 QDict *bs_dict;
1399 Monitor *mon = opaque;
1400
1401 bs_dict = qobject_to_qdict(obj);
1402
1403 monitor_printf(mon, "%s: type=%s removable=%d",
1404 qdict_get_str(bs_dict, "device"),
1405 qdict_get_str(bs_dict, "type"),
1406 qdict_get_bool(bs_dict, "removable"));
1407
1408 if (qdict_get_bool(bs_dict, "removable")) {
1409 monitor_printf(mon, " locked=%d", qdict_get_bool(bs_dict, "locked"));
1410 }
1411
1412 if (qdict_haskey(bs_dict, "inserted")) {
1413 QDict *qdict = qobject_to_qdict(qdict_get(bs_dict, "inserted"));
1414
1415 monitor_printf(mon, " file=");
1416 monitor_print_filename(mon, qdict_get_str(qdict, "file"));
1417 if (qdict_haskey(qdict, "backing_file")) {
1418 monitor_printf(mon, " backing_file=");
1419 monitor_print_filename(mon, qdict_get_str(qdict, "backing_file"));
1420 }
1421 monitor_printf(mon, " ro=%d drv=%s encrypted=%d",
1422 qdict_get_bool(qdict, "ro"),
1423 qdict_get_str(qdict, "drv"),
1424 qdict_get_bool(qdict, "encrypted"));
1425 } else {
1426 monitor_printf(mon, " [not inserted]");
1427 }
1428
1429 monitor_printf(mon, "\n");
1430 }
1431
1432 void bdrv_info_print(Monitor *mon, const QObject *data)
1433 {
1434 qlist_iter(qobject_to_qlist(data), bdrv_print_dict, mon);
1435 }
1436
1437 /**
1438 * bdrv_info(): Block devices information
1439 *
1440 * Each block device information is stored in a QDict and the
1441 * returned QObject is a QList of all devices.
1442 *
1443 * The QDict contains the following:
1444 *
1445 * - "device": device name
1446 * - "type": device type
1447 * - "removable": true if the device is removable, false otherwise
1448 * - "locked": true if the device is locked, false otherwise
1449 * - "inserted": only present if the device is inserted, it is a QDict
1450 * containing the following:
1451 * - "file": device file name
1452 * - "ro": true if read-only, false otherwise
1453 * - "drv": driver format name
1454 * - "backing_file": backing file name if one is used
1455 * - "encrypted": true if encrypted, false otherwise
1456 *
1457 * Example:
1458 *
1459 * [ { "device": "ide0-hd0", "type": "hd", "removable": false, "locked": false,
1460 * "inserted": { "file": "/tmp/foobar", "ro": false, "drv": "qcow2" } },
1461 * { "device": "floppy0", "type": "floppy", "removable": true,
1462 * "locked": false } ]
1463 */
1464 void bdrv_info(Monitor *mon, QObject **ret_data)
1465 {
1466 QList *bs_list;
1467 BlockDriverState *bs;
1468
1469 bs_list = qlist_new();
1470
1471 QTAILQ_FOREACH(bs, &bdrv_states, list) {
1472 QObject *bs_obj;
1473 const char *type = "unknown";
1474
1475 switch(bs->type) {
1476 case BDRV_TYPE_HD:
1477 type = "hd";
1478 break;
1479 case BDRV_TYPE_CDROM:
1480 type = "cdrom";
1481 break;
1482 case BDRV_TYPE_FLOPPY:
1483 type = "floppy";
1484 break;
1485 }
1486
1487 bs_obj = qobject_from_jsonf("{ 'device': %s, 'type': %s, "
1488 "'removable': %i, 'locked': %i }",
1489 bs->device_name, type, bs->removable,
1490 bs->locked);
1491
1492 if (bs->drv) {
1493 QObject *obj;
1494 QDict *bs_dict = qobject_to_qdict(bs_obj);
1495
1496 obj = qobject_from_jsonf("{ 'file': %s, 'ro': %i, 'drv': %s, "
1497 "'encrypted': %i }",
1498 bs->filename, bs->read_only,
1499 bs->drv->format_name,
1500 bdrv_is_encrypted(bs));
1501 if (bs->backing_file[0] != '\0') {
1502 QDict *qdict = qobject_to_qdict(obj);
1503 qdict_put(qdict, "backing_file",
1504 qstring_from_str(bs->backing_file));
1505 }
1506
1507 qdict_put_obj(bs_dict, "inserted", obj);
1508 }
1509 qlist_append_obj(bs_list, bs_obj);
1510 }
1511
1512 *ret_data = QOBJECT(bs_list);
1513 }
1514
1515 static void bdrv_stats_iter(QObject *data, void *opaque)
1516 {
1517 QDict *qdict;
1518 Monitor *mon = opaque;
1519
1520 qdict = qobject_to_qdict(data);
1521 monitor_printf(mon, "%s:", qdict_get_str(qdict, "device"));
1522
1523 qdict = qobject_to_qdict(qdict_get(qdict, "stats"));
1524 monitor_printf(mon, " rd_bytes=%" PRId64
1525 " wr_bytes=%" PRId64
1526 " rd_operations=%" PRId64
1527 " wr_operations=%" PRId64
1528 "\n",
1529 qdict_get_int(qdict, "rd_bytes"),
1530 qdict_get_int(qdict, "wr_bytes"),
1531 qdict_get_int(qdict, "rd_operations"),
1532 qdict_get_int(qdict, "wr_operations"));
1533 }
1534
1535 void bdrv_stats_print(Monitor *mon, const QObject *data)
1536 {
1537 qlist_iter(qobject_to_qlist(data), bdrv_stats_iter, mon);
1538 }
1539
1540 static QObject* bdrv_info_stats_bs(BlockDriverState *bs)
1541 {
1542 QObject *res;
1543 QDict *dict;
1544
1545 res = qobject_from_jsonf("{ 'stats': {"
1546 "'rd_bytes': %" PRId64 ","
1547 "'wr_bytes': %" PRId64 ","
1548 "'rd_operations': %" PRId64 ","
1549 "'wr_operations': %" PRId64 ","
1550 "'wr_highest_offset': %" PRId64
1551 "} }",
1552 bs->rd_bytes, bs->wr_bytes,
1553 bs->rd_ops, bs->wr_ops,
1554 bs->wr_highest_sector * 512);
1555 dict = qobject_to_qdict(res);
1556
1557 if (*bs->device_name) {
1558 qdict_put(dict, "device", qstring_from_str(bs->device_name));
1559 }
1560
1561 if (bs->file) {
1562 QObject *parent = bdrv_info_stats_bs(bs->file);
1563 qdict_put_obj(dict, "parent", parent);
1564 }
1565
1566 return res;
1567 }
1568
1569 /**
1570 * bdrv_info_stats(): show block device statistics
1571 *
1572 * Each device statistic information is stored in a QDict and
1573 * the returned QObject is a QList of all devices.
1574 *
1575 * The QDict contains the following:
1576 *
1577 * - "device": device name
1578 * - "stats": A QDict with the statistics information, it contains:
1579 * - "rd_bytes": bytes read
1580 * - "wr_bytes": bytes written
1581 * - "rd_operations": read operations
1582 * - "wr_operations": write operations
1583 * - "wr_highest_offset": Highest offset of a sector written since the
1584 * BlockDriverState has been opened
1585 * - "parent": A QDict recursively holding the statistics of the underlying
1586 * protocol (e.g. the host file for a qcow2 image). If there is no
1587 * underlying protocol, this field is omitted.
1588 *
1589 * Example:
1590 *
1591 * [ { "device": "ide0-hd0",
1592 * "stats": { "rd_bytes": 512,
1593 * "wr_bytes": 0,
1594 * "rd_operations": 1,
1595 * "wr_operations": 0,
1596 * "wr_highest_offset": 0 },
1597 * "parent": {
1598 * "stats": { "rd_bytes": 1024,
1599 * "wr_bytes": 0,
1600 * "rd_operations": 2,
1601 * "wr_operations": 0,
1602 * "wr_highest_offset": 0,
1603 * } } },
1604 * { "device": "ide1-cd0",
1605 * "stats": { "rd_bytes": 0,
1606 * "wr_bytes": 0,
1607 * "rd_operations": 0,
1608 * "wr_operations": 0,
1609 * "wr_highest_offset": 0 } },
1610 */
1611 void bdrv_info_stats(Monitor *mon, QObject **ret_data)
1612 {
1613 QObject *obj;
1614 QList *devices;
1615 BlockDriverState *bs;
1616
1617 devices = qlist_new();
1618
1619 QTAILQ_FOREACH(bs, &bdrv_states, list) {
1620 obj = bdrv_info_stats_bs(bs);
1621 qlist_append_obj(devices, obj);
1622 }
1623
1624 *ret_data = QOBJECT(devices);
1625 }
1626
1627 const char *bdrv_get_encrypted_filename(BlockDriverState *bs)
1628 {
1629 if (bs->backing_hd && bs->backing_hd->encrypted)
1630 return bs->backing_file;
1631 else if (bs->encrypted)
1632 return bs->filename;
1633 else
1634 return NULL;
1635 }
1636
1637 void bdrv_get_backing_filename(BlockDriverState *bs,
1638 char *filename, int filename_size)
1639 {
1640 if (!bs->backing_file) {
1641 pstrcpy(filename, filename_size, "");
1642 } else {
1643 pstrcpy(filename, filename_size, bs->backing_file);
1644 }
1645 }
1646
1647 int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num,
1648 const uint8_t *buf, int nb_sectors)
1649 {
1650 BlockDriver *drv = bs->drv;
1651 if (!drv)
1652 return -ENOMEDIUM;
1653 if (!drv->bdrv_write_compressed)
1654 return -ENOTSUP;
1655 if (bdrv_check_request(bs, sector_num, nb_sectors))
1656 return -EIO;
1657
1658 if (bs->dirty_bitmap) {
1659 set_dirty_bitmap(bs, sector_num, nb_sectors, 1);
1660 }
1661
1662 return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors);
1663 }
1664
1665 int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
1666 {
1667 BlockDriver *drv = bs->drv;
1668 if (!drv)
1669 return -ENOMEDIUM;
1670 if (!drv->bdrv_get_info)
1671 return -ENOTSUP;
1672 memset(bdi, 0, sizeof(*bdi));
1673 return drv->bdrv_get_info(bs, bdi);
1674 }
1675
1676 int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf,
1677 int64_t pos, int size)
1678 {
1679 BlockDriver *drv = bs->drv;
1680 if (!drv)
1681 return -ENOMEDIUM;
1682 if (!drv->bdrv_save_vmstate)
1683 return -ENOTSUP;
1684 return drv->bdrv_save_vmstate(bs, buf, pos, size);
1685 }
1686
1687 int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf,
1688 int64_t pos, int size)
1689 {
1690 BlockDriver *drv = bs->drv;
1691 if (!drv)
1692 return -ENOMEDIUM;
1693 if (!drv->bdrv_load_vmstate)
1694 return -ENOTSUP;
1695 return drv->bdrv_load_vmstate(bs, buf, pos, size);
1696 }
1697
1698 void bdrv_debug_event(BlockDriverState *bs, BlkDebugEvent event)
1699 {
1700 BlockDriver *drv = bs->drv;
1701
1702 if (!drv || !drv->bdrv_debug_event) {
1703 return;
1704 }
1705
1706 return drv->bdrv_debug_event(bs, event);
1707
1708 }
1709
1710 /**************************************************************/
1711 /* handling of snapshots */
1712
1713 int bdrv_snapshot_create(BlockDriverState *bs,
1714 QEMUSnapshotInfo *sn_info)
1715 {
1716 BlockDriver *drv = bs->drv;
1717 if (!drv)
1718 return -ENOMEDIUM;
1719 if (!drv->bdrv_snapshot_create)
1720 return -ENOTSUP;
1721 return drv->bdrv_snapshot_create(bs, sn_info);
1722 }
1723
1724 int bdrv_snapshot_goto(BlockDriverState *bs,
1725 const char *snapshot_id)
1726 {
1727 BlockDriver *drv = bs->drv;
1728 if (!drv)
1729 return -ENOMEDIUM;
1730 if (!drv->bdrv_snapshot_goto)
1731 return -ENOTSUP;
1732 return drv->bdrv_snapshot_goto(bs, snapshot_id);
1733 }
1734
1735 int bdrv_snapshot_delete(BlockDriverState *bs, const char *snapshot_id)
1736 {
1737 BlockDriver *drv = bs->drv;
1738 if (!drv)
1739 return -ENOMEDIUM;
1740 if (!drv->bdrv_snapshot_delete)
1741 return -ENOTSUP;
1742 return drv->bdrv_snapshot_delete(bs, snapshot_id);
1743 }
1744
1745 int bdrv_snapshot_list(BlockDriverState *bs,
1746 QEMUSnapshotInfo **psn_info)
1747 {
1748 BlockDriver *drv = bs->drv;
1749 if (!drv)
1750 return -ENOMEDIUM;
1751 if (!drv->bdrv_snapshot_list)
1752 return -ENOTSUP;
1753 return drv->bdrv_snapshot_list(bs, psn_info);
1754 }
1755
1756 #define NB_SUFFIXES 4
1757
1758 char *get_human_readable_size(char *buf, int buf_size, int64_t size)
1759 {
1760 static const char suffixes[NB_SUFFIXES] = "KMGT";
1761 int64_t base;
1762 int i;
1763
1764 if (size <= 999) {
1765 snprintf(buf, buf_size, "%" PRId64, size);
1766 } else {
1767 base = 1024;
1768 for(i = 0; i < NB_SUFFIXES; i++) {
1769 if (size < (10 * base)) {
1770 snprintf(buf, buf_size, "%0.1f%c",
1771 (double)size / base,
1772 suffixes[i]);
1773 break;
1774 } else if (size < (1000 * base) || i == (NB_SUFFIXES - 1)) {
1775 snprintf(buf, buf_size, "%" PRId64 "%c",
1776 ((size + (base >> 1)) / base),
1777 suffixes[i]);
1778 break;
1779 }
1780 base = base * 1024;
1781 }
1782 }
1783 return buf;
1784 }
1785
1786 char *bdrv_snapshot_dump(char *buf, int buf_size, QEMUSnapshotInfo *sn)
1787 {
1788 char buf1[128], date_buf[128], clock_buf[128];
1789 #ifdef _WIN32
1790 struct tm *ptm;
1791 #else
1792 struct tm tm;
1793 #endif
1794 time_t ti;
1795 int64_t secs;
1796
1797 if (!sn) {
1798 snprintf(buf, buf_size,
1799 "%-10s%-20s%7s%20s%15s",
1800 "ID", "TAG", "VM SIZE", "DATE", "VM CLOCK");
1801 } else {
1802 ti = sn->date_sec;
1803 #ifdef _WIN32
1804 ptm = localtime(&ti);
1805 strftime(date_buf, sizeof(date_buf),
1806 "%Y-%m-%d %H:%M:%S", ptm);
1807 #else
1808 localtime_r(&ti, &tm);
1809 strftime(date_buf, sizeof(date_buf),
1810 "%Y-%m-%d %H:%M:%S", &tm);
1811 #endif
1812 secs = sn->vm_clock_nsec / 1000000000;
1813 snprintf(clock_buf, sizeof(clock_buf),
1814 "%02d:%02d:%02d.%03d",
1815 (int)(secs / 3600),
1816 (int)((secs / 60) % 60),
1817 (int)(secs % 60),
1818 (int)((sn->vm_clock_nsec / 1000000) % 1000));
1819 snprintf(buf, buf_size,
1820 "%-10s%-20s%7s%20s%15s",
1821 sn->id_str, sn->name,
1822 get_human_readable_size(buf1, sizeof(buf1), sn->vm_state_size),
1823 date_buf,
1824 clock_buf);
1825 }
1826 return buf;
1827 }
1828
1829
1830 /**************************************************************/
1831 /* async I/Os */
1832
1833 BlockDriverAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num,
1834 QEMUIOVector *qiov, int nb_sectors,
1835 BlockDriverCompletionFunc *cb, void *opaque)
1836 {
1837 BlockDriver *drv = bs->drv;
1838 BlockDriverAIOCB *ret;
1839
1840 if (!drv)
1841 return NULL;
1842 if (bdrv_check_request(bs, sector_num, nb_sectors))
1843 return NULL;
1844
1845 ret = drv->bdrv_aio_readv(bs, sector_num, qiov, nb_sectors,
1846 cb, opaque);
1847
1848 if (ret) {
1849 /* Update stats even though technically transfer has not happened. */
1850 bs->rd_bytes += (unsigned) nb_sectors * BDRV_SECTOR_SIZE;
1851 bs->rd_ops ++;
1852 }
1853
1854 return ret;
1855 }
1856
1857 BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num,
1858 QEMUIOVector *qiov, int nb_sectors,
1859 BlockDriverCompletionFunc *cb, void *opaque)
1860 {
1861 BlockDriver *drv = bs->drv;
1862 BlockDriverAIOCB *ret;
1863
1864 if (!drv)
1865 return NULL;
1866 if (bs->read_only)
1867 return NULL;
1868 if (bdrv_check_request(bs, sector_num, nb_sectors))
1869 return NULL;
1870
1871 if (bs->dirty_bitmap) {
1872 set_dirty_bitmap(bs, sector_num, nb_sectors, 1);
1873 }
1874
1875 ret = drv->bdrv_aio_writev(bs, sector_num, qiov, nb_sectors,
1876 cb, opaque);
1877
1878 if (ret) {
1879 /* Update stats even though technically transfer has not happened. */
1880 bs->wr_bytes += (unsigned) nb_sectors * BDRV_SECTOR_SIZE;
1881 bs->wr_ops ++;
1882 if (bs->wr_highest_sector < sector_num + nb_sectors - 1) {
1883 bs->wr_highest_sector = sector_num + nb_sectors - 1;
1884 }
1885 }
1886
1887 return ret;
1888 }
1889
1890
1891 typedef struct MultiwriteCB {
1892 int error;
1893 int num_requests;
1894 int num_callbacks;
1895 struct {
1896 BlockDriverCompletionFunc *cb;
1897 void *opaque;
1898 QEMUIOVector *free_qiov;
1899 void *free_buf;
1900 } callbacks[];
1901 } MultiwriteCB;
1902
1903 static void multiwrite_user_cb(MultiwriteCB *mcb)
1904 {
1905 int i;
1906
1907 for (i = 0; i < mcb->num_callbacks; i++) {
1908 mcb->callbacks[i].cb(mcb->callbacks[i].opaque, mcb->error);
1909 if (mcb->callbacks[i].free_qiov) {
1910 qemu_iovec_destroy(mcb->callbacks[i].free_qiov);
1911 }
1912 qemu_free(mcb->callbacks[i].free_qiov);
1913 qemu_vfree(mcb->callbacks[i].free_buf);
1914 }
1915 }
1916
1917 static void multiwrite_cb(void *opaque, int ret)
1918 {
1919 MultiwriteCB *mcb = opaque;
1920
1921 if (ret < 0 && !mcb->error) {
1922 mcb->error = ret;
1923 multiwrite_user_cb(mcb);
1924 }
1925
1926 mcb->num_requests--;
1927 if (mcb->num_requests == 0) {
1928 if (mcb->error == 0) {
1929 multiwrite_user_cb(mcb);
1930 }
1931 qemu_free(mcb);
1932 }
1933 }
1934
1935 static int multiwrite_req_compare(const void *a, const void *b)
1936 {
1937 return (((BlockRequest*) a)->sector - ((BlockRequest*) b)->sector);
1938 }
1939
1940 /*
1941 * Takes a bunch of requests and tries to merge them. Returns the number of
1942 * requests that remain after merging.
1943 */
1944 static int multiwrite_merge(BlockDriverState *bs, BlockRequest *reqs,
1945 int num_reqs, MultiwriteCB *mcb)
1946 {
1947 int i, outidx;
1948
1949 // Sort requests by start sector
1950 qsort(reqs, num_reqs, sizeof(*reqs), &multiwrite_req_compare);
1951
1952 // Check if adjacent requests touch the same clusters. If so, combine them,
1953 // filling up gaps with zero sectors.
1954 outidx = 0;
1955 for (i = 1; i < num_reqs; i++) {
1956 int merge = 0;
1957 int64_t oldreq_last = reqs[outidx].sector + reqs[outidx].nb_sectors;
1958
1959 // This handles the cases that are valid for all block drivers, namely
1960 // exactly sequential writes and overlapping writes.
1961 if (reqs[i].sector <= oldreq_last) {
1962 merge = 1;
1963 }
1964
1965 // The block driver may decide that it makes sense to combine requests
1966 // even if there is a gap of some sectors between them. In this case,
1967 // the gap is filled with zeros (therefore only applicable for yet
1968 // unused space in format like qcow2).
1969 if (!merge && bs->drv->bdrv_merge_requests) {
1970 merge = bs->drv->bdrv_merge_requests(bs, &reqs[outidx], &reqs[i]);
1971 }
1972
1973 if (reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1 > IOV_MAX) {
1974 merge = 0;
1975 }
1976
1977 if (merge) {
1978 size_t size;
1979 QEMUIOVector *qiov = qemu_mallocz(sizeof(*qiov));
1980 qemu_iovec_init(qiov,
1981 reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1);
1982
1983 // Add the first request to the merged one. If the requests are
1984 // overlapping, drop the last sectors of the first request.
1985 size = (reqs[i].sector - reqs[outidx].sector) << 9;
1986 qemu_iovec_concat(qiov, reqs[outidx].qiov, size);
1987
1988 // We might need to add some zeros between the two requests
1989 if (reqs[i].sector > oldreq_last) {
1990 size_t zero_bytes = (reqs[i].sector - oldreq_last) << 9;
1991 uint8_t *buf = qemu_blockalign(bs, zero_bytes);
1992 memset(buf, 0, zero_bytes);
1993 qemu_iovec_add(qiov, buf, zero_bytes);
1994 mcb->callbacks[i].free_buf = buf;
1995 }
1996
1997 // Add the second request
1998 qemu_iovec_concat(qiov, reqs[i].qiov, reqs[i].qiov->size);
1999
2000 reqs[outidx].nb_sectors += reqs[i].nb_sectors;
2001 reqs[outidx].qiov = qiov;
2002
2003 mcb->callbacks[i].free_qiov = reqs[outidx].qiov;
2004 } else {
2005 outidx++;
2006 reqs[outidx].sector = reqs[i].sector;
2007 reqs[outidx].nb_sectors = reqs[i].nb_sectors;
2008 reqs[outidx].qiov = reqs[i].qiov;
2009 }
2010 }
2011
2012 return outidx + 1;
2013 }
2014
2015 /*
2016 * Submit multiple AIO write requests at once.
2017 *
2018 * On success, the function returns 0 and all requests in the reqs array have
2019 * been submitted. In error case this function returns -1, and any of the
2020 * requests may or may not be submitted yet. In particular, this means that the
2021 * callback will be called for some of the requests, for others it won't. The
2022 * caller must check the error field of the BlockRequest to wait for the right
2023 * callbacks (if error != 0, no callback will be called).
2024 *
2025 * The implementation may modify the contents of the reqs array, e.g. to merge
2026 * requests. However, the fields opaque and error are left unmodified as they
2027 * are used to signal failure for a single request to the caller.
2028 */
2029 int bdrv_aio_multiwrite(BlockDriverState *bs, BlockRequest *reqs, int num_reqs)
2030 {
2031 BlockDriverAIOCB *acb;
2032 MultiwriteCB *mcb;
2033 int i;
2034
2035 if (num_reqs == 0) {
2036 return 0;
2037 }
2038
2039 // Create MultiwriteCB structure
2040 mcb = qemu_mallocz(sizeof(*mcb) + num_reqs * sizeof(*mcb->callbacks));
2041 mcb->num_requests = 0;
2042 mcb->num_callbacks = num_reqs;
2043
2044 for (i = 0; i < num_reqs; i++) {
2045 mcb->callbacks[i].cb = reqs[i].cb;
2046 mcb->callbacks[i].opaque = reqs[i].opaque;
2047 }
2048
2049 // Check for mergable requests
2050 num_reqs = multiwrite_merge(bs, reqs, num_reqs, mcb);
2051
2052 // Run the aio requests
2053 for (i = 0; i < num_reqs; i++) {
2054 acb = bdrv_aio_writev(bs, reqs[i].sector, reqs[i].qiov,
2055 reqs[i].nb_sectors, multiwrite_cb, mcb);
2056
2057 if (acb == NULL) {
2058 // We can only fail the whole thing if no request has been
2059 // submitted yet. Otherwise we'll wait for the submitted AIOs to
2060 // complete and report the error in the callback.
2061 if (mcb->num_requests == 0) {
2062 reqs[i].error = -EIO;
2063 goto fail;
2064 } else {
2065 mcb->num_requests++;
2066 multiwrite_cb(mcb, -EIO);
2067 break;
2068 }
2069 } else {
2070 mcb->num_requests++;
2071 }
2072 }
2073
2074 return 0;
2075
2076 fail:
2077 qemu_free(mcb);
2078 return -1;
2079 }
2080
2081 BlockDriverAIOCB *bdrv_aio_flush(BlockDriverState *bs,
2082 BlockDriverCompletionFunc *cb, void *opaque)
2083 {
2084 BlockDriver *drv = bs->drv;
2085
2086 if (!drv)
2087 return NULL;
2088 return drv->bdrv_aio_flush(bs, cb, opaque);
2089 }
2090
2091 void bdrv_aio_cancel(BlockDriverAIOCB *acb)
2092 {
2093 acb->pool->cancel(acb);
2094 }
2095
2096
2097 /**************************************************************/
2098 /* async block device emulation */
2099
2100 typedef struct BlockDriverAIOCBSync {
2101 BlockDriverAIOCB common;
2102 QEMUBH *bh;
2103 int ret;
2104 /* vector translation state */
2105 QEMUIOVector *qiov;
2106 uint8_t *bounce;
2107 int is_write;
2108 } BlockDriverAIOCBSync;
2109
2110 static void bdrv_aio_cancel_em(BlockDriverAIOCB *blockacb)
2111 {
2112 BlockDriverAIOCBSync *acb =
2113 container_of(blockacb, BlockDriverAIOCBSync, common);
2114 qemu_bh_delete(acb->bh);
2115 acb->bh = NULL;
2116 qemu_aio_release(acb);
2117 }
2118
2119 static AIOPool bdrv_em_aio_pool = {
2120 .aiocb_size = sizeof(BlockDriverAIOCBSync),
2121 .cancel = bdrv_aio_cancel_em,
2122 };
2123
2124 static void bdrv_aio_bh_cb(void *opaque)
2125 {
2126 BlockDriverAIOCBSync *acb = opaque;
2127
2128 if (!acb->is_write)
2129 qemu_iovec_from_buffer(acb->qiov, acb->bounce, acb->qiov->size);
2130 qemu_vfree(acb->bounce);
2131 acb->common.cb(acb->common.opaque, acb->ret);
2132 qemu_bh_delete(acb->bh);
2133 acb->bh = NULL;
2134 qemu_aio_release(acb);
2135 }
2136
2137 static BlockDriverAIOCB *bdrv_aio_rw_vector(BlockDriverState *bs,
2138 int64_t sector_num,
2139 QEMUIOVector *qiov,
2140 int nb_sectors,
2141 BlockDriverCompletionFunc *cb,
2142 void *opaque,
2143 int is_write)
2144
2145 {
2146 BlockDriverAIOCBSync *acb;
2147
2148 acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque);
2149 acb->is_write = is_write;
2150 acb->qiov = qiov;
2151 acb->bounce = qemu_blockalign(bs, qiov->size);
2152
2153 if (!acb->bh)
2154 acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb);
2155
2156 if (is_write) {
2157 qemu_iovec_to_buffer(acb->qiov, acb->bounce);
2158 acb->ret = bdrv_write(bs, sector_num, acb->bounce, nb_sectors);
2159 } else {
2160 acb->ret = bdrv_read(bs, sector_num, acb->bounce, nb_sectors);
2161 }
2162
2163 qemu_bh_schedule(acb->bh);
2164
2165 return &acb->common;
2166 }
2167
2168 static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs,
2169 int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
2170 BlockDriverCompletionFunc *cb, void *opaque)
2171 {
2172 return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 0);
2173 }
2174
2175 static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs,
2176 int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
2177 BlockDriverCompletionFunc *cb, void *opaque)
2178 {
2179 return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 1);
2180 }
2181
2182 static BlockDriverAIOCB *bdrv_aio_flush_em(BlockDriverState *bs,
2183 BlockDriverCompletionFunc *cb, void *opaque)
2184 {
2185 BlockDriverAIOCBSync *acb;
2186
2187 acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque);
2188 acb->is_write = 1; /* don't bounce in the completion hadler */
2189 acb->qiov = NULL;
2190 acb->bounce = NULL;
2191 acb->ret = 0;
2192
2193 if (!acb->bh)
2194 acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb);
2195
2196 bdrv_flush(bs);
2197 qemu_bh_schedule(acb->bh);
2198 return &acb->common;
2199 }
2200
2201 /**************************************************************/
2202 /* sync block device emulation */
2203
2204 static void bdrv_rw_em_cb(void *opaque, int ret)
2205 {
2206 *(int *)opaque = ret;
2207 }
2208
2209 #define NOT_DONE 0x7fffffff
2210
2211 static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num,
2212 uint8_t *buf, int nb_sectors)
2213 {
2214 int async_ret;
2215 BlockDriverAIOCB *acb;
2216 struct iovec iov;
2217 QEMUIOVector qiov;
2218
2219 async_context_push();
2220
2221 async_ret = NOT_DONE;
2222 iov.iov_base = (void *)buf;
2223 iov.iov_len = nb_sectors * 512;
2224 qemu_iovec_init_external(&qiov, &iov, 1);
2225 acb = bdrv_aio_readv(bs, sector_num, &qiov, nb_sectors,
2226 bdrv_rw_em_cb, &async_ret);
2227 if (acb == NULL) {
2228 async_ret = -1;
2229 goto fail;
2230 }
2231
2232 while (async_ret == NOT_DONE) {
2233 qemu_aio_wait();
2234 }
2235
2236
2237 fail:
2238 async_context_pop();
2239 return async_ret;
2240 }
2241
2242 static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num,
2243 const uint8_t *buf, int nb_sectors)
2244 {
2245 int async_ret;
2246 BlockDriverAIOCB *acb;
2247 struct iovec iov;
2248 QEMUIOVector qiov;
2249
2250 async_context_push();
2251
2252 async_ret = NOT_DONE;
2253 iov.iov_base = (void *)buf;
2254 iov.iov_len = nb_sectors * 512;
2255 qemu_iovec_init_external(&qiov, &iov, 1);
2256 acb = bdrv_aio_writev(bs, sector_num, &qiov, nb_sectors,
2257 bdrv_rw_em_cb, &async_ret);
2258 if (acb == NULL) {
2259 async_ret = -1;
2260 goto fail;
2261 }
2262 while (async_ret == NOT_DONE) {
2263 qemu_aio_wait();
2264 }
2265
2266 fail:
2267 async_context_pop();
2268 return async_ret;
2269 }
2270
2271 void bdrv_init(void)
2272 {
2273 module_call_init(MODULE_INIT_BLOCK);
2274 }
2275
2276 void bdrv_init_with_whitelist(void)
2277 {
2278 use_bdrv_whitelist = 1;
2279 bdrv_init();
2280 }
2281
2282 void *qemu_aio_get(AIOPool *pool, BlockDriverState *bs,
2283 BlockDriverCompletionFunc *cb, void *opaque)
2284 {
2285 BlockDriverAIOCB *acb;
2286
2287 if (pool->free_aiocb) {
2288 acb = pool->free_aiocb;
2289 pool->free_aiocb = acb->next;
2290 } else {
2291 acb = qemu_mallocz(pool->aiocb_size);
2292 acb->pool = pool;
2293 }
2294 acb->bs = bs;
2295 acb->cb = cb;
2296 acb->opaque = opaque;
2297 return acb;
2298 }
2299
2300 void qemu_aio_release(void *p)
2301 {
2302 BlockDriverAIOCB *acb = (BlockDriverAIOCB *)p;
2303 AIOPool *pool = acb->pool;
2304 acb->next = pool->free_aiocb;
2305 pool->free_aiocb = acb;
2306 }
2307
2308 /**************************************************************/
2309 /* removable device support */
2310
2311 /**
2312 * Return TRUE if the media is present
2313 */
2314 int bdrv_is_inserted(BlockDriverState *bs)
2315 {
2316 BlockDriver *drv = bs->drv;
2317 int ret;
2318 if (!drv)
2319 return 0;
2320 if (!drv->bdrv_is_inserted)
2321 return 1;
2322 ret = drv->bdrv_is_inserted(bs);
2323 return ret;
2324 }
2325
2326 /**
2327 * Return TRUE if the media changed since the last call to this
2328 * function. It is currently only used for floppy disks
2329 */
2330 int bdrv_media_changed(BlockDriverState *bs)
2331 {
2332 BlockDriver *drv = bs->drv;
2333 int ret;
2334
2335 if (!drv || !drv->bdrv_media_changed)
2336 ret = -ENOTSUP;
2337 else
2338 ret = drv->bdrv_media_changed(bs);
2339 if (ret == -ENOTSUP)
2340 ret = bs->media_changed;
2341 bs->media_changed = 0;
2342 return ret;
2343 }
2344
2345 /**
2346 * If eject_flag is TRUE, eject the media. Otherwise, close the tray
2347 */
2348 int bdrv_eject(BlockDriverState *bs, int eject_flag)
2349 {
2350 BlockDriver *drv = bs->drv;
2351 int ret;
2352
2353 if (bs->locked) {
2354 return -EBUSY;
2355 }
2356
2357 if (!drv || !drv->bdrv_eject) {
2358 ret = -ENOTSUP;
2359 } else {
2360 ret = drv->bdrv_eject(bs, eject_flag);
2361 }
2362 if (ret == -ENOTSUP) {
2363 if (eject_flag)
2364 bdrv_close(bs);
2365 ret = 0;
2366 }
2367
2368 return ret;
2369 }
2370
2371 int bdrv_is_locked(BlockDriverState *bs)
2372 {
2373 return bs->locked;
2374 }
2375
2376 /**
2377 * Lock or unlock the media (if it is locked, the user won't be able
2378 * to eject it manually).
2379 */
2380 void bdrv_set_locked(BlockDriverState *bs, int locked)
2381 {
2382 BlockDriver *drv = bs->drv;
2383
2384 bs->locked = locked;
2385 if (drv && drv->bdrv_set_locked) {
2386 drv->bdrv_set_locked(bs, locked);
2387 }
2388 }
2389
2390 /* needed for generic scsi interface */
2391
2392 int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf)
2393 {
2394 BlockDriver *drv = bs->drv;
2395
2396 if (drv && drv->bdrv_ioctl)
2397 return drv->bdrv_ioctl(bs, req, buf);
2398 return -ENOTSUP;
2399 }
2400
2401 BlockDriverAIOCB *bdrv_aio_ioctl(BlockDriverState *bs,
2402 unsigned long int req, void *buf,
2403 BlockDriverCompletionFunc *cb, void *opaque)
2404 {
2405 BlockDriver *drv = bs->drv;
2406
2407 if (drv && drv->bdrv_aio_ioctl)
2408 return drv->bdrv_aio_ioctl(bs, req, buf, cb, opaque);
2409 return NULL;
2410 }
2411
2412
2413
2414 void *qemu_blockalign(BlockDriverState *bs, size_t size)
2415 {
2416 return qemu_memalign((bs && bs->buffer_alignment) ? bs->buffer_alignment : 512, size);
2417 }
2418
2419 void bdrv_set_dirty_tracking(BlockDriverState *bs, int enable)
2420 {
2421 int64_t bitmap_size;
2422
2423 bs->dirty_count = 0;
2424 if (enable) {
2425 if (!bs->dirty_bitmap) {
2426 bitmap_size = (bdrv_getlength(bs) >> BDRV_SECTOR_BITS) +
2427 BDRV_SECTORS_PER_DIRTY_CHUNK * 8 - 1;
2428 bitmap_size /= BDRV_SECTORS_PER_DIRTY_CHUNK * 8;
2429
2430 bs->dirty_bitmap = qemu_mallocz(bitmap_size);
2431 }
2432 } else {
2433 if (bs->dirty_bitmap) {
2434 qemu_free(bs->dirty_bitmap);
2435 bs->dirty_bitmap = NULL;
2436 }
2437 }
2438 }
2439
2440 int bdrv_get_dirty(BlockDriverState *bs, int64_t sector)
2441 {
2442 int64_t chunk = sector / (int64_t)BDRV_SECTORS_PER_DIRTY_CHUNK;
2443
2444 if (bs->dirty_bitmap &&
2445 (sector << BDRV_SECTOR_BITS) < bdrv_getlength(bs)) {
2446 return bs->dirty_bitmap[chunk / (sizeof(unsigned long) * 8)] &
2447 (1 << (chunk % (sizeof(unsigned long) * 8)));
2448 } else {
2449 return 0;
2450 }
2451 }
2452
2453 void bdrv_reset_dirty(BlockDriverState *bs, int64_t cur_sector,
2454 int nr_sectors)
2455 {
2456 set_dirty_bitmap(bs, cur_sector, nr_sectors, 0);
2457 }
2458
2459 int64_t bdrv_get_dirty_count(BlockDriverState *bs)
2460 {
2461 return bs->dirty_count;
2462 }
Stefan Hajnoczi's patches